Fix rare crash when deleting posts

[kean]

Fixes #22247

I'm not entirely sure what leads to the crash https://a8c.sentry.io/issues/4716966489/?project=1438083&referrer=github_integration but it seems to be due to the order of updates/notifications when PostCoordinator deletes the post object and sends the "object-did-update" notification at the same time. In order to address it, I simply removed the redundant "did-update" notification.

To test:

(In Posts Lists)

• Delete a post and verify that it gets deleted
• Mock the request failure or turn the connection off and verify that the post cell shows and hides the "Deleting.." message during the deletion attempt

Regression Notes

1. Potential unintended areas of impact: Post List
2. What I did to test those areas of impact (or what existing automated tests I relied on): manual
3. What automated tests I added (or what prevented me from doing so): n/a

PR submission checklist:

• I have completed the Regression Notes.
• I have considered adding unit tests for my changes.
• I have considered adding accessibility improvements for my changes.
• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

UI Changes testing checklist:

• Portrait and landscape orientations.
• Light and dark modes.
• Fonts: Larger, smaller and bold text.
• High contrast.
• VoiceOver.
• Languages with large words or with letters/accents not frequently used in English.
• Right-to-left languages. (Even if translation isn’t complete, formatting should still respect the right-to-left layout)
• iPhone and iPad.
• Multi-tasking: Split view and Slide over. (iPad)

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	1 Warning
⚠️	This PR is assigned to the milestone 24.0. This milestone is due in less than 4 days. Please make sure to get it merged by then or assign it to a milestone with a later deadline.

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